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  • Elsevier  (99)
  • Springer  (50)
  • Wiley-Blackwell  (36)
  • 2020-2021
  • 1985-1989  (109)
  • 1980-1984  (76)
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  • 1
    Electronic Resource
    Electronic Resource
    Ternary systems of two interacting copolymers and a solvent (1983)
    Springer
    Polymer bulletin 9 (1983), S. 313-320 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Closed loop diagrams were obtained with ternary systems containing two interacting copolymers (styrene-4-vinylpyridine / styrene-methacrylic acid or methyl methacrylate-4-vinylpyridine / methyl methacrylate-methacrylic acid) and a solvent (dioxane or chloroform). Viscosimetric interaction parameters were determined in both solvents. Higher interactions in chloroform than in dioxane were evidenced from greater positive Δ b23. A single glass transition temperature obtained with the pair of copolymers of styrene-methacrylic acid / butyl methacrylate-4-vinylpyridine confirmed the compatibility of these copolymers in the solid state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00262724
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  • 2
    Electronic Resource
    Electronic Resource
    Association between acidic and basic copolymers by low angle laser light scattering photometry (1982)
    Springer
    Polymer bulletin 7 (1982), S. 607-614 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Measurements of both apparent molecular weight and second virial coefficient of solutions of styrene-4-vinylpyridine copolymer in ethyl benzoate containing varying concentrations of methyl methacrylate-methacrylic acid copolymer isorefractive with ethyl benzoate were carried out by low angle laser light scattering. The apparent molecular weight depended very little on the acidic copolymer concentration. The second virial coefficient first decreased rapidly, then increased and finally tends to level off as the acidic copolymer concentration was raised. Great association is observed when the visible polymer is in excess.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00256094
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  • 3
    Electronic Resource
    Electronic Resource
    Reactions with heterocyclic amidines, VII: Synthesis of some new pyrazolo[1,5-c]-1,2,4-triazines, pyrazolo[1,5-a]-1,3,5-triazines and pyrazolo[1,5-a]pyrimidines (1981)
    Springer
    Monatshefte für Chemie 112 (1981), S. 245-252 
    Details
    ISSN: 1434-4475
    Keywords: Cyanoethylation ; Heterocyclic compounds
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Diazotiertes 5-Amino-3-methyl-4-phenylpyrazol (1) reagiert mit einer aktiven Methylenkomponente und β-Naphthol zu den Pyrazolo[1,5-c]-1,2,4-triazin-Derivaten2a-e und5. 1 ergibt mit Benzoylisothiocyanat und Phenylisothiocyanat die entsprechenden Pyrazol-5-yl-thioharnstoffe6a, b. 5a wurde mittels Säure oder Base in das Thioharnstoffderivat8 umgewandelt. Es wird über eine Synthese von 2-Methyl-3-phenyl-4,5,6,7-tetrahydropyrazolo[1,5-a]-pyrimidin-5-on aus α-Phenylacetoacetonitril (3-Oxo-2-phenyl-butyronitril) und β-Cyanoethylhydrazin berichtet.
    Notes: Abstract Diazotised 5-amino-3-methyl-4-phenyloyrazole (1) reacted with active methylene reagents and with β-naphthol to yield the pyrazolo[1,5-c)-1,2,4-triazine derivatives2a-e and5. Compound1 reacted with benzoyl isothiocyanate and with phenyl isothiocyanate to yield the corresponding pyrazol-5-ylthiourea derivatives6a, b. 5a was converted into the thiourea derivative8 by the action of acids or alkalies. A synthesis of 2-methyl-3-phenyl-4,5,6,7-tetrahydropyrazolo[1,5-a]-pyrimidin-5-one from the reaction of α-phenylacetoactonitrile (3-oxo-2-phenyl-butyric nitrile) and β-cyanoethylhydrazine is reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00911090
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  • 4
    Electronic Resource
    Electronic Resource
    Role of the structural and electronic properties of molybdenum trioxide catalysts on the structure-sensitive oxidation of methanol to formaldehyde (1989)
    Springer
    Monatshefte für Chemie 120 (1989), S. 199-209 
    Details
    ISSN: 1434-4475
    Keywords: Molybdenum trioxide ; Structure-sensitive oxidation of methanol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Auf zwei verschiedene Arten hergestellte Molybdäntrioxidkatalysatoren wurden für selektive Oxidationen untersucht. Die Ergebnisse der Dampfphasenoxidation von Methanol werden auf Basis der sauren Eigenschaften, der oxidierenden Funktionen und der kristallographischen Struktur der Katalysatoren diskutiert. Es wurde festgestellt, daß die sauren Eigenschaften zur Erklärung der entscheidenden Wirksamkeit der Katalysatoren nicht alleine verantwortlich sind. Elektrische Leitfähigkeitsmessungen zeigten, daß molekularer Sauerstoff im zugeleiteten Gas zur Erhaltung der katalytischen Aktivität notwendig ist. Die Unterschiede in der Katalysatoraktivität und der Selektivität sind aus der Struktur der Katalysatoren zu erklären. Es wird ein adäquater Redox-Mechanismus diskutiert.
    Notes: Summary As catalysts for selective oxidation, molybdenum trioxide catalysts—prepared by two different methods—have been investigated. The results of vapor-phase oxidation of methanol are discussed on the basis of the acidic property, oxidizing functions, and the crystallographic structure of the catalysts. It was found that the acidic property is not the sole factor deciding the catalytic activity. Electrical conductivity measurements proved that molecular oxygen in the gas feed is necessary for maintaining the catalysts active. The difference in the catalytic activity and selectivity were reasonably interpreted in view of the structure sensitivity of those catalysts. A redox mechanism is also discussed in this paper.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00809275
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  • 5
    Electronic Resource
    Electronic Resource
    On the Burnside problem for periodic groups (1983)
    Springer
    Mathematische Zeitschrift 182 (1983), S. 385-388 
    Details
    ISSN: 1432-1823
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01179757
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  • 6
    Electronic Resource
    Electronic Resource
    Sur les foncteurs dérivés de la déstabilisation (1987)
    Springer
    Mathematische Zeitschrift 194 (1987), S. 25-59 
    Details
    ISSN: 1432-1823
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01168004
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  • 7
    Electronic Resource
    Electronic Resource
    Studies on 5-aminopyrazole derivatives synthesis of some new fused pyrazole derivatives (1984)
    Springer
    Monatshefte für Chemie 115 (1984), S. 431-436 
    Details
    ISSN: 1434-4475
    Keywords: Enaminonitriles ; Fused Pyrazoles
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Reaktion von 5-Amino-4-cyano-3-phenylpyrazol (1) mit Acrylnitril oder Ethylacrylate ergibt 4-Cyano-3-phenyl-4,5,6,7-tetrahydro-5-oxopyrazolo-[1,5-a]-pyrimidin (2). Die Reaktion von1 mit Harnstoff, Thioharnstoff und7. Ethyl acetoacetat ergibt die Pyrazolopyrimidinderivate6a,6b und7. Andererseits entsteht das Thioharnstoffderivat4 durch die Reaktion von1 mit Benzoylisothiocyanat. Diazotiertes1 koppelt mit Malononitril und Ethylcyanoacetat zu den Pyrazolopyrimidinen10 und11, die Kopplung mit α-chloroacetoacetic ester und Acetylaceton ergibt jedoch die Hydrazone12 und13.
    Notes: Abstract 5-Amino-4-cyano-3-phenylpyrazole (1) reacts with acrylonitrile or ethyl acrylate to yield 4-cyano-3-phenyl-4,5,6,7-tetrahydro-5-oxopyrazolo-[1,5-a]-pyrimidine (2). With urea, thiourea and ethyl acetoacetate1 gives the pyrazolopyrimidine derivatives6a,6b, and7 respectively. On the other hand, compound1 reacted with benzoylisothiocyanate to give the corresponding thiourea derivative4. Diazotized1 was coupled with malononitrile and ethyl cyanoacetate to yield the pyrazolopyrimidine derivatives10 and11, respectively, whereas on coupling with α-chloro acetoacetic ester and with acetylacetone the hydrazones12 and13 were obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00810004
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  • 8
    Electronic Resource
    Electronic Resource
    Ferroelectricity associated with the metastable phase “III” of AgNO3 (1987)
    Springer
    Applied physics 43 (1987), S. 65-70 
    Details
    ISSN: 1432-0630
    Keywords: 64 ; 77 ; 85.50
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The dielectric constant, dc resistance, D-E ferroelectric hysteresis loop and dilatometric analysis of the three phases I, II, and III of AgNO3 single crystals has been studied over the temperature range 100–200° C. A ferroelectric behaviour of the metastable phase III was detected here for the first time similar to what happened in KNO3. The ferroelectric is attributed here to Ag+-ion vacancy formation in the unit cell of AgNO3. The energy activating the process of vacancy formation was found to beE v=2.6 eV. It was found that an ionic shift from one lattice point to another requires an amount of energy to overcome a potential barrierE m=0.1 eV. A model is suggested to explain such behaviour. Dilatometric analysis indicated that this metastable phase transition I→II is accompanied by an expansion of the unit cell.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00615208
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  • 9
    Electronic Resource
    Electronic Resource
    A note on subnormality in factorizable finite groups (1984)
    Springer
    Archiv der Mathematik 42 (1984), S. 97-101 
    Details
    ISSN: 1420-8938
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01772926
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  • 10
    Electronic Resource
    Electronic Resource
    Detection of carriers for duchenne muscular dystrophy. Quality control of creatine kinase assay (1982)
    Springer
    Human genetics 〈Berlin〉 61 (1982), S. 205-209 
    Details
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A report by Bullock and coworkers has emphasized the need for standardization of the CK assay in carrier detection for DMD. A collaborative study, according to a well-specified design and involving two laboratories in Paris and Lyon, indicates that the reliability of this assay can be improved provided that special attention is paid to information about participating subjects, laboratory protocol, and repeated sampling. On a random sample of young women, mean and variance of 1n(CK) are 1.66 and 0.015 respectively. Within and between variance components are in a 3:4 ratio, homogeneous between populations. Additional use of a common test serum should insure good reliability of this assay among laboratories.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00296443
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